Actuating apparatus for a motor vehicle brake

ABSTRACT

The invention relates to an actuating device for a motor vehicle brake, comprising the following components:
         an actuating device, in particular in the form of a brake pedal,   a pressure supply device ( 11 ), in particular a reciprocating pump or double-acting reciprocating pump, driven by an electric motor drive (M),   a piston-cylinder unit (main cylinder) ( 10 ) that can be actuated by means of the actuating device, that is connected hydraulically with a hydraulic fluid reservoir (BFR) and that forms at least two pressure chambers that are connected with hydraulic brake circuits,   a valve assembly (HCU) with valves for adjusting brake pressures in a wheel-specific manner and for disconnecting or connecting the wheel brakes from or to the pressure supply device ( 11 ) and the piston-cylinder unit ( 10 ),   an electronic control unit (ECU),   at least one sensor device, having at least one sensor or evaluation element ( 3, 4, 5, 24, 24   a ) and a sensor target ( 5   a,    23, 23   a ), preferably based on an electromagnetic principle,
 
for sensing a movement of a device component.
       

     According to the invention, 
     at least one sensor or evaluation element ( 3, 4, 5, 24, 24   a ) of the sensor device is arranged on or in the electronic control unit (ECU), in particular on a system printed circuit board (PCB) of the control unit ( 25 ), and
 
that a movement of the device component ( 10; 45; 46; 48 ) is transmitted to the electronic control unit (ECU) ( 25 ) via a sensor actuating device, in particular via a mechanical actuating mechanism ( 17, 18, 19 ) or via a sensor target ( 5   a,    23, 23   a ) connected with the device component and magnetic flux-conducting components ( 43, 43 , a,  43   b ) based on ferromagnetic materials.

The present invention relates to an actuating apparatus for a motor vehicle brake according to the preamble of claim 1.

PRIOR ART

In view of the many new systems being introduced by automotive manufacturers (OEMs), the installation of assemblies, in particular in the engine compartment, increasingly presents problems due to the limited installation spaces. In some cases for example, the ABS/ESP unit is arranged behind the engine, above all in front-wheel drives and transverse engines. The consequence is that when replacing the ABS/ESP unit the engine is in the way and may possibly need to be removed.

There is therefore a desire among OEMs to reduce the size of existing systems or to develop new systems that are as integrated and compact as possible in order for example to circumvent the problems outlined above. In addition, there are right-hand and left-hand drives, and the brake system package or combination of elements of a brake system (consisting of vacuum pump, braking force booster and ABS/ESP assembly) should preferably remain the same despite differences in their arrangement.

The current trend is to change the spatial distribution of the brake system combination over to compact and integrated “1-box solutions”. In this case, all the necessary components such as pressure supply, hydraulic (valve) unit (HCU), control unit (ECU) and main cylinder are combined in a single structural unit. Such a compact “1-box brake system” is for example described in DE 10 2012 213 216.

In functional terms, a part of the “1-box brake system” replaces the vacuum booster and the vacuum pump with an electric motor. This provides a freely adjustable braking force boosting that can be modulated by means of pedal travel. This measurement of the travel of the brake pedal is effected through a pedal interface. The hydraulic supply of the “1-box brake system” with brake fluid is provided, as usual, via a reservoir that in most cases measures the fluid level using a float. Expediently, in order to increase the compactness of the brake system, the reservoir is also integrated into the brake system.

In order to fulfil the functions of an integrated brake system (1-box brake system) described above, as a rule five functionally essential sensor types are required:

-   -   Rotation angle sensor(s), used for commutation of the motor and         to determine the position of the piston (a possible measuring         device is shown in the patent DE 10 2011 017 436; gear drive for         the target magnet used for angle measurement).     -   Preferably two pedal travel sensors that are able to perform a         force measurement and register piston seizure and sensor failure         (a corresponding example is disclosed in the patent DE 10 2011         050 869 A1).     -   Pressure sensor(s) that measures the main cylinder pressure     -   A filling level sensor for the integrated brake fluid reservoir.     -   Optionally, an electrode can be provided that detects a leak in         a small collecting container positioned in a suitable location,         for example underneath the system

Currently, there are different approaches to the arrangement of the individual sensors and system components:

-   -   In DE 10 2014 214095, the rotatable spindle used to drive the         piston is greatly lengthened in order to determine the position         of the motor. A target magnet is connected with the spindle that         can be sensed by a sensor on the system printed circuit board.         -   Similar solutions are known in actuators, for example in DE             10 2014 218034, in which the sensors used to control the             motor are mounted on the system printed circuit board.     -   In the brake system shown in DE 10 2012 213 216, a first         cylinder-piston arrangement actuated by the vehicle's driver is         described. The pressure-generating device and the valve block         are also arranged in the same housing. The axis of the electric         motor of the pressure-generating device is arranged         substantially perpendicular to the longitudinal axis of the         first cylinder-piston arrangement. This solution is intended to         achieve a certain degree of compactness, which can however be         further improved (width, length). In particular, the         adaptability to different installation situations leaves         something to be desired, for example installation in the engine         compartment (so-called “front bolted” installation).

OBJECT OF THE INVENTION

The object of the invention is to create the most compact brake actuation system possible, which, in particular, also offers a great deal of latitude in constructive design with regard to the sensor devices and can thus also be used flexibly in different vehicles or installation situations.

Solution of the Problem

This problem is solved according to the invention in that at least one sensor or evaluation element of the sensor device is arranged in the electronic control unit (ECU), in particular on a system printed circuit board (PCB) of the control unit, or is connected with this, and that a movement of the device components is transmitted to the electronic control unit (ECU) via a sensor actuating device, in particular via a mechanical sensor target or via a sensor target connected with the device components and magnetic flux-conducting components based on ferromagnetic materials.

In other words, a transmission of movements or sensor signals by means of a mechanical transmission device to a sensor target takes place (as already disclosed, in principle, in the priority application DE 10 2015 104246.0, the content of which is incorporated in full herein) or by means of a magnetic device, wherein in particular flux-conducting components are used in proximity to sensor or evaluation elements on a system printed circuit board (PCB) of the control unit (ECU).

With the solution according to the invention, a brake actuation system is created that, with respect to the sensor devices, enables a flexible, compact arrangement that is favourable in terms of weight and costs, and is moreover adaptable, allowing different flexible layout possibilities in terms of the arrangement of the main components (HCU, ECU, motor, pedal interface, main brake cylinder, pressure supply), taking into consideration the installation conditions, and that enables an economical and fail-safe solution without using cables/plugs. In particular, the limiting condition that not all sensors may be arranged in direct proximity to the ECU is to be taken into consideration. This relates, in particular, to the most important sensors (pedal stroke sensor, motor angle sensor).

According to an advantageous embodiment of the invention, the sensor or evaluation elements of at least one sensor device, in particular the sensor or evaluation elements of a pedal movement sensor, of a motor movement or rotation angle sensor and of a piston movement sensor or also other sensors, or all sensor devices, are arranged on a system printed circuit board (PCB) arranged in the electronic control unit (ECU), and the actuation targets (for example permanent magnets) are arranged in proximity to the evaluation element, or the magnetic signal is carried via flux-conducting components into proximity with the PCB.

In particular, a mechanical transmission of the sensor signals can expediently be made to a target in proximity to the evaluation element in the ECU or the system printed circuit board (PCB), or using flux-conducting components as a transmission medium.

Expediently, a sensor for determining the movement travel of a piston of the piston-cylinder unit or of a brake pedal (BP) connected thereto can be provided, wherein the actuation of the sensor target takes place by means of the mechanical actuating mechanism, in particular by means of a linkage and gear arrangement.

According to a further advantageous embodiment, a sensor for determining the movement travel of a piston of the piston-cylinder unit or of a brake pedal (BP) connected thereto is provided, wherein at least one sensor target is arranged on the piston and the transmission to the electronic control unit (ECU) is effected by means of flux-conducting components.

In particular, a sensor for determining the motor or rotor movement can be provided, wherein the actuation of the sensor target takes place by means of the mechanical actuating mechanism, in particular by means of a linkage and gear arrangement.

According to a further variant, the gearing is arranged in a separate housing on or in the motor and a frictional coupling with the target drive is provided.

According to another advantageous embodiment, a sensor for determining the motor or rotor movement is provided, wherein at least one sensor target is arranged on the rotor or on an element connected thereto, in particular a pole disc, and the transmission to the electronic control unit (ECU) is effected by means of flux-conducting components.

Expediently, a sensor for determining the movement of a level sensor is provided, in particular in a float of a reservoir (VB), wherein a sensor target is arranged on a moveable part of the level sensor, in particular on the float, and the transmission from the sensor target to the electronic control unit is effected by means of flux-conducting components.

In particular, the sensor elements of at least one sensor, in particular all sensors, can be arranged on a system printed circuit board (PCB) located in the electronic control unit (ECU).

The distance of the sensor target or the flux-conducting components from the sensor or evaluation element is short, in particular less than 5 mm.

According to an advantageous embodiment, at least one of the sensors or one of the evaluation elements is a Hall element, wherein in particular its external and protective circuitry is arranged on the system printed circuit board (PCB).

In an advantageous embodiment, the actuating device has at least a first (GH1) and a second (GH2) housing unit, wherein in particular the first housing unit (GH1) accommodates all pistons of the piston-cylinder unit (main cylinder) and the pressure supply unit and the second housing unit (HCU)(GH2) accommodates the valve assembly. In particular, at least one sensor actuating device can be partially arranged in the first (GH1) or/and second housing unit (GH2) and/or the motor housing, or can be passed through this.

With the invention, or its advantageous variants and embodiments, a 1-box solution is created that fulfils the following requirements and has the following advantages:

-   -   small installation space and installation length     -   largely symmetrical design suitable for left-hand drives (LL)         and right-hand drives (RL)     -   good accessibility of the hydraulic and electrical connections         for installation     -   mounting on the front wall (bulkhead) of the vehicle possible         from the engine (“front bolted”) as well as from the footwell     -   lowest possible costs and weight     -   modular design for different expansion stages, for example         autonomous driving     -   high fail-safety     -   low failure rate

According to the invention or its advantageous variants and embodiments, the following measures are also provided (wherein in particular a structure with at least two housings is proposed):

-   -   a first housing (GH1), which accommodates all system-relevant         pistons (THZ, pistons for the pressure supply and pump), has a         mounting flange for the bulkhead and possesses a pedal interface         with pedal sensor actuation.     -   a second housing (GH2; HCU, Hydraulic Control Unit), with         solenoid valves, non-return valves, orifices and pressure         sensors, which for attachment purposes are caulked or         press-fitted with a suitable deformable material, for example         aluminium.     -   both housings can also be extended or combined into one housing.     -   the electrical control unit ECU is mounted directly on the HCU,         as is nowadays usual worldwide.     -   the low costs, low failure rates and interference immunity can         be achieved in that the sensor evaluation element (Hall sensor)         is mounted directly on the system printed circuit board and the         target is located in close proximity.     -   There is no need for an additional printed circuit board with         plug connection. Interference affecting the connection cables         does not therefore occur. The whole sensor with target can be         realised most simply if the target, with corresponding         actuation, is mounted directly on the sensor element. This can         be realised with an actuation via a gear drive, both for pedal         travel as well as for the motor. This is more difficult in the         case of a motor that is arranged at a distance from the system         printed circuit board. A good solution in terms of handling         during the manufacture of the motor and overall installation is         to have the gear wheels mounted independently in the motor. For         the operation of the sensors, during final testing of the motor         a shaft is coupled with the gear wheel by means of a frictional         connection. When assembled, the shaft, with the target, is fixed         in the housing unit the during overall installation. All         parameters such as frictional connection, mechanical resistances         and signals can be checked.     -   If the pedal travel sensors are also designed with a gear drive         (analogously to the measuring principle used for the motor         position), then the mechanical drive can be of single or         redundant design. If a redundant drive is used, it is expedient         to use an electrical element (E-KWS) that also allows a blocking         of the drive to be detected.     -   If a gear drive is not desired in pedal travel sensors, the         target magnet can for example be mounted in the piston. The         change in flux over the direction of the piston on actuation of         the pedal can for example be transmitted via flux-conducting         components to a Hall sensor.     -   This principle can also be applied to the level sensor for the         brake fluid reservoir, with “only” a threshold value being         detected in this case. Again, flux-conducting components can be         helpful here, since they allow the sensor element not to         positioned in proximity to the target magnet. Alternatively, an         optical method could also be used here.     -   A 1D Hall sensor with only two connections can be used to detect         the position of a piston or level sensor. As already mentioned,         in this case the sensor element would be mounted directly on the         system printed circuit board or connected by means of a plug.     -   The motor is mounted underneath the GH1 at the greatest possible         distance from the bulkhead of the vehicle. It is desirable here         to create plenty of space for the hydraulic and electrical         connecting lines. If necessary, it can in addition be installed         inclined forwards at an angle.     -   The motor is connected in the GH1 with a pump, ideally with a         reciprocating pump or double-acting reciprocating pump.     -   A reservoir is mounted on the system at the side and is         connected with the suction intake of the pump.     -   The sensor actuators are accommodated in or passed through the         GH1 or the GH2 and transmit the movement of the pedal and of the         rotor to a rotatable target magnet. The evaluation element (for         example rotation angle sensor (Hall sensor)) is mounted directly         on the system printed circuit board or is connected therewith.         This means that no additional cables and/or printed circuit         boards (PCBs) are necessary in order to accommodate, for         example, the Hall element.     -   At least one sensor element is connected with the system printed         circuit board that measures the fluid level in the reservoir.     -   An electrical connecting element (plug) connected to the         vehicle's electrical system is attached from the side or from         the front to an attachment of the control unit (ECU). This is         advantageous, since it creates additional installation volume in         the assembly space. The latter requires a short construction         length of GH1 and GH2. Alternatively, the control unit can be         arranged at the side or at the front.     -   The hydraulic connecting lines to the wheel brakes are attached         to the front in order to simplify accessibility for left-hand         and right-hand drives.     -   Any leakage through seals can be collected by means of a motor         housing that is extended in its lower part and is sensed by         means of an electrode.

Further embodiments or variants of the invention and their advantages are contained in further claims, to which reference is made here.

In the drawings:

FIG. 1: shows a schematic representation of an actuating device for a brake system for a motor vehicle;

FIG. 2: shows a view of the brake system from the front, with the subdivision and structure of the main components;

FIG. 3: shows a motor sensor drive;

FIG. 4: shows a first part of a pedal travel sensor drive (connecting element to the actuating pedal);

FIG. 4a : shows a second part of a pedal travel sensor drive (connecting element to the target);

FIG. 5: shows a piston travel measurement with several magnet targets with a flux-conducting component leading to the sensor evaluation element;

FIG. 5a : shows a piston travel measurement with a magnet target in the piston and several flux-conducting components/sensor evaluation elements;

FIG. 5b : shows a further piston travel measurement with flux-conducting components;

FIG. 6: shows the position of the level sensor with flux-conducting components;

FIG. 7: shows motor sensors with segment sensor and flux-conducting components.

FIG. 1 shows the structuring and interaction of the individual components of a 1-box brake system. The essential components consist of:

-   -   brake pedal (BP)     -   pedal interface (PI) with tandem main cylinder (THZ)     -   motor (M) with pressure piston     -   hydraulic block (HCU or GH2)     -   control unit (ECU)     -   plug (connection to vehicle's electrical system for supply and         communication)     -   reservoir or compensating tank

The interaction with the driver takes place starting from the brake pedal, which acts on the TMC piston via the pedal interface. At all times, the pedal travel is measured by means of two sensors housed in the system for this purpose. The displaced volume from the TMC piston passes on into the hydraulic unit (HCU), which contains solenoid valves (MV) and a pressure sensor. All valves and the pressure sensor as well as all sensor connections are connected with the electrical control unit and combined and enclosed in the housing of the electrical control unit. The connected sensors in the ECU include a motor position sensor, two pedal travel sensors, a pressure sensor, a filling level sensor and, optionally, an electrode for leakage flow detection, with a correspondingly small container, which is for example integrated in the HCU or ECU housing. The housing is fixed to the hydraulic unit (HCU) by means of screws. A sealing ring between the two components (HCU and ECU) prevents the penetration of various foreign bodies. The energy supply and the external communication with other control devices is effected via a plug on the brake system. The system also has a pressure supply, which is driven by an electric motor. This pressure supply can take different forms, which are for example described in DE 10 2014 117 726. In order to supply the whole brake system with the necessary brake fluid, a reservoir or supply container is situated on the system.

FIG. 2 shows one mechanical structure from the brake system described with reference to FIG. 1, starting from the front in the direction of the bulkhead of a vehicle. Beginning from the bottom, the motor (M) is attached to the housing HU1 by means of the mounting 14. The motor drives a pump 11 connected via suction valves 16 with the reservoir (VB). Possible pump designs are described in the patent specifications DE 10 2014 109 628 and DE 10 2014 117 726. The housing GH1, in which moveable pistons are mounted, is integrated on a mounting flange 13 attached to the bulkhead and is accessible from the engine compartment, which makes possible a so-called “front-bolted” installation. For this purpose, a corresponding recess for the fastening tool needs to be provided on the side of the reservoir or supply container (VB).

The drive of a sensor target is mounted in the housing GH2; these are illustrated in detail in FIGS. 3a and 4. The motor rotation angle target can be installed in front of (9 a) or behind (9 b) the motor and can measure the angular position of the motor. As already described with reference to FIG. 1, the control unit (ECU) is mounted, in a sealed manner, on the housing HU2 with solenoid coils and contacts for all sensors, valves and motor.

To the side or also to the front there is a connecting element 1 (main plug) with the wiring harness 2 leading to the vehicle's electrical system. Attached on the underside of the motor housing is a housing extension in which the aforementioned electrode for leakage detection is housed. A possible leakage flow is for example conducted from the piston into a bowl on the spindle and downwards through a spindle bore. If the direction of the pedal interface is considered as the axis of rotation, the system can be installed in the vehicle rotated by +/−90°. Naturally, the position of the brake pedal remains the same; however, the aforementioned collecting container must be rearranged accordingly. Possible positions would be next to the GH1 or even in the ECU.

Alternatively to the embodiment shown, other conceivable variants of 1-box brake systems exist (for example as described in DE102012213216A1). In this embodiment too, due to the limiting conditions for installation, the motor and pedal stroke or piston travel is arranged in immediate proximity to the PCB of the ECU and a plurality of sensors is to be connected with the ECU. In other words, also in this approach, and in alternative approaches to packaging solutions, the flexible connection of sensor signals via mechanical transmission members or flux-conducting components according to the invention is advantageous and avoids complicated contacting, reduces costs and increases reliability.

FIG. 3 shows the drive of a motor rotation angle sensor illustrated in FIG. 2. The drive gear wheel 17 is mounted on the shaft in front of or behind the motor. This gear wheel 17 is bevel geared to reduce noise and engages with a drive gear wheel 18, which is pressed onto an anti-rotation lock 20. The shaft is preferably mounted in the housing HU2 in a bearing bush 21. The flexural elasticity provided by the extensive length from the bearing 21 to the gearing 20 a is used to ensure that the gear wheel 17 runs without play. On the shaft end nearest the sensor there is a target magnet 23 with a receptacle made of plastic 22, which forms an opposing storage in the housing GH2. The magnet is sensed by means of a sensor element 24 (for example a Hall sensor) on the system printed circuit board 25.

A gear wheel housing is fixed inside the motor housing that contains the bearings of the drive gear wheel on both sides. The knurled shaft is adequately secured against rotation in the resilient flange of the gear wheel 18, which substantially only needs to withstand the slight bearing friction and moment of inertia during acceleration of the motor. The motor with gear drive can thus also be tested during the final testing of the motor, by plugging a shaft into the measuring device. During the final installation of the assemblies, the shaft 19 with its bearings is fixed in the GH2 and the sensor tested in the assembled state.

FIG. 4 shows the actuation of the pedal travel sensors. For safety reasons, two pedal travel sensors are used that are used for pedal force measurement via a spring element—see also the applicant's DE 10 2011 101 655, which will be further addressed and referred to here. Thus, a pedal tappet 27 with a pedal plate 28 is coupled with a piston 31, which acts on a spring element 30. This acts on the piston 31 in order to generate pressure in the main cylinder (THZ) in the pressure chamber 33. In this connection, see the applicant's patent DE 10 2014 117 726, to which reference is made in this respect. This piston 31 is connected with a piston plate 29. In order to actuate the sensor the pedal plate 28 is connected with a first gear rack 26 and a piston plate 29 is connected with a second gear rack 26 a. The two gear racks 26, 26 a drive a gear wheel each, 24, 34 a, as shown in FIG. 4a . The first housing GH1 is fixed in the front wall region with the mounting flange 13.

FIG. 4a shows a sensor drive for both pedal travel sensors. Gear racks 26 and 26 a act on different levels on gear wheels 34 and 34 a. The connection to the sensor target very largely corresponds to the motor sensor shown in FIG. 3. Here too, flexurally elastic shafts 19 a, 19 b are used that are mounted in bearing bushes 21 and 21 a and fixed together with the sensor target 22 a and with the target 23 a (magnet) so as to prevent rotation. The target 23 a acts on a sensor element 24 a, which is fixed, together with the other sensor elements, on the common system printed circuit board (PCB) 25 in an electrically conductive manner. In line with the proven prior art, the housing 35 of the control unit ECU contains the system printed circuit board (PCB) 25 with all components and the solenoid coils shown in FIG. 2. Due to heat dissipation, the system printed circuit board (PCP) 25 is mounted on an aluminium plate, since the MOSFETs used for the motor control in particular generate heat loss. This can be transferred simply through the aluminium plate, via a thermally conductive strip, to the second housing.

FIG. 5 shows an arrangement for measuring a movement of a piston 10, which can also be connected with a brake pedal (BP) and thus also measures the pedal travel. The magnetic flux of a target magnet is passed to the sensor via flux-conducting components 43 or 43 b by means of a sensor element 24 a, which is mounted on the system printed circuit board 25. The magnets are magnetised differently depending on the arrangement of the magnetic circuit with flux-conducting components. The upper and lower halves of the figure show two different possible arrangements or embodiments. The arrangement shown above is based on the change in flux of several magnets 23 of differing polarity and can be measured by means of the sensor element 24 a. In contrast, the arrangement shown below and its travel measurement only require one target magnet; however, the magnetic flux must be conducted through the flux-conducting components in a different way. The back iron 43 and the flux-conducting component 43 a are configured such that that with the movement of the magnet in the direction of measurement a N/S polarity can be detected. Depending on the arrangement, the air gap, magnets and flux-conducting components must be designed accordingly in order to guarantee a suitable measurement. Ultimately, the linearization and the signal processing of the travel measurement can take place either in the sensor elements or in the ECU. In connection with FIG. 5, the view X of the embodiment shown above in FIG. 5 is illustrated separately below. The piston 10, flux-conducting components 43, permanent magnets 23 and sensor element 24 a are shown in the illustration.

In terms of construction design, different options exist for minimising the air gap, for example in A, gluing or caulking in a recess of the housing 44. The flux-conducting components can be manufactured economically as stamped, pressed or moulded parts. Depending on the requirements in terms of travel and accuracy, different sensor targets can be connected in succession. The signal waveform of the sensor element, for example sinusoidal, is prior art and is not shown separately.

FIG. 5a shows, in a simplified manner, an alternative for the arrangement of the sensor target 23 and sensor element 24 a with flux-conducting components, in that only a single target in the piston 10 with seal 10 a activates different sensor elements 24 a. The magnetic circuit is described in FIG. 5.

FIG. 5b shows an arrangement for pedal travel measurement in which the sensor target 23 is mounted on a separate rod 45 or slider in the housing 44 and is connected with the pedal plate 28. The magnetic circuit is shown in the illustration and, with the target magnet 23, which is connected with the rod or bar 45, has a N-S polarity. The flux is passed via the flux-conducting components 43 and 43 b to the sensor element 24 a. This arrangement allows constructively optimised housing within the overall packaging of the system independently of the main cylinder piston.

FIG. 6 illustrates the principle of using flux-conducting components to measure the filling level of the brake fluid reservoir VB. For this purpose, the sensor target is mounted in the float 46, and the magnetic flux is passed via the flux-conducting components 43, 43 a, 43 b to the sensor element 24 a, which is in turn mounted on the system printed circuit board (PCB) 25. In this case the flux-conducting components are injection-moulded into a housing connected with and fixed to the housing unit GH1 or GH2. The sealing of the ECU housing is provided by the seal S.

FIG. 7 illustrates the principle of using flux-conducting components to measure the motor position, as an alternative to FIG. 3. The arrangement has a known magnet ring 48 composed of segment magnets on the motor, which is connected with the rotor 47. The magnet ring is sensed with a sensor element 24 a and depending on the number of magnet ring segments can measure a certain rotor angle in absolute terms. This application is widely used, this structure having been modified with flux-conducting components. The magnet ring can have a radial arrangement (upper half of figure) or axial arrangement of the poles (lower half of figure). Here too, the magnetic flux is conducted from the target 23 via flux-conducting components 43, 43 a, 43 b to the sensor element 24 a on the system PCB 25 in the ECU housing. The magnetic circuit can correspond to FIG. 5b , in which the flux-conducting components are arranged in a segment and are mounted in the housing unit 1 or 2. The motor is connected electrically with the system printed circuit board (PCB) 25 via electrical connecting elements 12.

This sensor concept, in which the sensor element of preferably all the sensors is mounted on the system printed circuit board (PCB) 25, represents an economical solution with a great deal of latitude in terms of constructive design.

LIST OF REFERENCE SIGNS

-   1 connecting element (main plug) -   2 wiring harness -   3 sensor element for pedal travel -   3 a actuation target for pedal travel sensor -   4 sensor element for motor rotation -   4 a actuation target for motor travel sensor -   5 sensor element for filling level -   5 a target for filling level sensor -   6 float in the reservoir -   7 extended motor housing or leak collector -   8 electrode -   9 drive for target actuation of motor encoder in front of the motor     rotor -   9 a drive for target actuation of motor encoder behind the motor     rotor -   10 TMC piston -   10 a piston seal -   11 pump or pump piston -   12 electrical connecting element to motor with several cables -   13 flange for mounting on front wall -   14 motor mounting -   15 hydraulic connection to wheel brake -   16 connection to pump suction valve -   17 drive gear wheel -   18 output gear wheel -   19 shaft 1 -   19 a/b shaft 2 and 3 -   20 anti-rotation lock (knurl) -   21 bearing bush -   21 a bearing bush -   22 target holder -   22 a target holder -   23 target (magnet) -   23 a target (magnet) -   24 sensor element -   24 a sensor element -   25 system printed circuit board PCB -   26 gear rack 1 -   26 a gear rack 2 -   27 pedal tappet -   28 pedal plate -   29 piston plate -   30 spring for force-displacement measurement -   31 piston -   32 sealing and bearing bush -   33 pressure chamber for piston -   34 gear wheel 1 -   34 a gear wheel 2 -   35 ECU housing -   36 thermally conductive strip -   37 E/E construction units -   38 assemblies, for example air conditioning -   39 front wall -   40 cable compartment -   41 limit stop ring -   42 gear wheel housing -   43 flux-conducting components -   43 a back iron flux-conducting component a -   43 b ditto b -   44 housing -   45 rod/slider -   46 float -   47 rotor -   48 magnet ring -   GH1 first housing unit -   GH2 second housing unit -   VB brake fluid reservoir -   PI pedal interface -   MV solenoid valves -   LL left-hand drive -   RL right-hand drive -   PCP circuit board -   K_(SP) magnet coil connection -   D seal 

1. Actuating apparatus for a motor vehicle brake, comprising the following components: an actuating device, in particular a brake pedal, a pressure supply device (11), in particular a reciprocating pump or double-acting reciprocating pump, driven by an electric motor drive (M), a piston-cylinder unit (main cylinder) (10) that can be actuated by means of the actuating device, that is connected hydraulically with a hydraulic fluid reservoir (VB) and that forms at least two pressure chambers that are connected with hydraulic brake circuits, a valve assembly (HCU) with valves for adjusting brake pressures in a wheel-specific manner and for disconnecting or connecting the wheel brakes from or to the pressure supply device (11) and the piston-cylinder unit (10), an electronic control unit (ECU), and at least one sensor device, having at least one sensor or evaluation element (3, 4, 5, 24, 24 a) and a sensor target (5 a, 23, 23 a), preferably based on an electromagnetic principle, for sensing a movement a device component, characterised in that at least one sensor or evaluation element (3, 4, 5, 24, 24 a) of the sensor device is arranged in the electronic control unit (ECU), in particular on a system printed circuit board (PCB) of the control unit (25) or is connected with this, and that a movement of the device component (10; 45; 46; 48) is transmitted to the electronic control unit (ECU) (25) via a sensor actuating device, in particular via a mechanical actuating mechanism (17, 18, 19) or via a sensor target (5 a, 23, 23 a) connected with the device component and magnetic flux-conducting components (43, 43, a, 43 b) based on ferromagnetic materials.
 2. Actuating apparatus according to claim 1, characterised in that the sensor or evaluation elements (3, 4, 5, 24, 24 a) of at least one sensor device, in particular the pedal travel sensor(s), or of a group of sensor devices, in particular all sensor devices, are arranged on the system printed circuit board (PCB) (25) arranged in the electronic control unit (ECU).
 3. Actuating apparatus according to claim 1 or 2, characterised in that at least the sensor or evaluation elements of the sensor device that is relevant in terms of dynamic function with critical reliability and accuracy (pedal movement sensor device, motor rotation angle sensor device, piston movement sensor device) are arranged in the electronic control unit (ECU), in particular on the system printed circuit board (25).
 4. Actuating apparatus according to any of the preceding claims, characterised in that a sensor device for determining the movement travel of a piston (10) of the piston-cylinder unit (main cylinder) or of a brake pedal (BP) connected thereto is provided, wherein the actuation of the sensor target (23, 23 a) is effected by means of the mechanical actuating mechanism, in particular by means of a linkage and gear arrangement (17, 18, 19).
 5. Actuating apparatus according to any of the preceding claims, characterised in that a sensor device for determining the movement travel of a piston (10) of the piston-cylinder unit or of a brake pedal (BP) connected thereto is provided, wherein at least one sensor target (23) is arranged on the piston (10) and wherein the transmission to the associated sensor or evaluation element is effected by means of flux-conducting components (43, 43 a, 43 b).
 6. Actuating apparatus according to any of the preceding claims, characterised in that a sensor device for determining the motor or rotor movement is provided, wherein the actuation of the sensor target (23, 23 a) is effected by means of the mechanical actuating mechanism, in particular by means of a linkage and gear arrangement (17, 18, 19, 26, 26 a, 34, 34 a).
 7. Actuating apparatus according to claim 6, characterised in that the gearing is arranged in a separate housing on or in the motor and a frictional coupling with the target drive is provided.
 8. Actuating apparatus according to any of the preceding claims, characterised in that a sensor device for determining the motor or rotor movement is provided, wherein at least one sensor target is arranged on the rotor or on an element connected thereto, in particular a pole disc, and the transmission to the electronic control unit (ECU) is effected by means of flux-conducting components (43, 43 b).
 9. Actuating apparatus according to any of the preceding claims, characterised in that a sensor device for determining the movement of a level sensor is provided, in particular in a float (46) of a reservoir (VB), wherein a sensor target (23) is arranged on a moveable part of the level sensor, in particular on the float, and the transmission from the sensor target (23) to the sensor or evaluation element is effected by means of flux-conducting components (53, 43 a, 43 b).
 10. Actuating apparatus according to any of the preceding claims, characterised in that the distance of the sensor target or the flux-conducting components from the sensor or evaluation element is short, in particular less than 5 mm.
 11. Actuating apparatus according to any of the preceding claims, characterised in that at least one of the sensor or evaluation elements is a Hall element, wherein in particular its external and protective circuitry is arranged on the system printed circuit board (PCB) (25).
 12. Actuating apparatus according to one of the preceding claims, characterised in that at least one sensor target is actuated via a pinion (9, 9 a).
 13. Actuating apparatus according to claim 12, characterised in that a play compensation is provided on the pinion (9, 9 a) that in particular has an elastic shaft (19).
 14. Actuating apparatus for a motor vehicle brake, in particular according to any of the preceding claims, characterised in that the actuating device has at least a first (GH1) and a second (GH2) housing unit, wherein the first housing unit (GH1) accommodates, in particular, all pistons of the piston-cylinder unit (main cylinder) and the pressure supply unit and the second housing unit (HCU)(GH2) accommodates the valve assembly.
 15. Actuating apparatus according to claim 12, characterised in that the control unit (ECU) is arranged in a third housing unit (25) that is in particular mounted directly on the second housing unit (HCU) (GH2) and is connected with this.
 16. Actuating apparatus according to any of the preceding claims, characterised in that the motor (M) is connected with the first housing unit (GH1) or the pressure supply device (11).
 17. Actuating apparatus according to any of the preceding claims, characterised in that the motor (M) of the drive is attached to the first housing unit (GH1), wherein in particular the motor axis is oriented at an angle (alpha) of less than 30° relative to the longitudinal axis of the first housing unit (GH1).
 18. Actuating apparatus according to any of the preceding claims, characterised in that the actuation axis or longitudinal axis of the piston-cylinder unit (main cylinder) runs substantially perpendicular to the actuation axis or longitudinal axis of the pressure supply device (11).
 19. Actuating apparatus according to any of the preceding claims, characterised in that the reservoir (VB) is arranged at the side of the first housing unit (GH1) and the second housing unit (GH2) as well as the electronic control unit (ECU) and is in particular connected with the suction intake of the pressure supply unit (11).
 20. Actuating apparatus according to any of the preceding claims, characterised in that at least one sensor actuating device is arranged partially in the first (GH1) or/and the second housing unit (GH2) and/or the motor housing or is passed through the same.
 21. Actuating apparatus according to any of the preceding claims, characterised in that redundant pedal travel sensors are actuated by means of gear racks (26, 26 a) that are coupled with a brake pedal, in particular via a piston plate.
 22. Actuating apparatus according to any of the preceding claims, characterised in that at least one sensor actuating device has a device for converting a translational movement into a rotational movement.
 23. Actuating apparatus according to claim 22, characterised in that that the pedal travel sensors detect a translational movement, in particular of the brake pedal, which is converted into a rotational movement of a target, wherein the target is in particular realised as a N/S permanent magnet.
 24. Actuating apparatus according to any of the preceding claims, characterised in that at least one sensor actuating device has a device for changing the direction of movement, in particular perpendicular to the actuation direction.
 25. Actuating apparatus according to any of the preceding claims, characterised in that the motor housing has an extension (7) for collecting leaking fluid, wherein in particular a sensor (8) for detecting leaking fluid is provided in the extension.
 26. Actuating apparatus for a motor vehicle brake, having an actuating device, in particular a brake pedal, a pressure supply device (pump) driven by an electric motor drive, a piston-cylinder unit (main cylinder) that can be actuated by means of the actuating device, that is connected hydraulically with a pressure medium reservoir and that forms at least two pressure chambers that are connected with hydraulic brake circuits, a valve assembly with valves for adjusting brake pressures in a wheel-specific manner and for disconnecting or connecting the wheel brakes from or to the pressure supply device and the piston-cylinder unit and possibly further valves and an electronic control unit (ECU), in particular according to any of the preceding claims, wherein sensors are provided, characterised in that at least the sensor elements of the pedal travel sensors, in particular all sensor elements, are arranged on a system printed circuit board (PCB).
 27. Actuating apparatus according to claim 26, characterised in that sensor actuators are arranged in a first housing unit (GH1) or/and in a second housing unit (GH2) and movements of the actuating device, in particular of the brake pedal and of the motor rotor, are transmitted to a sensor target (in particular a magnet), and wherein an evaluation element of the sensor is arranged on a system printed circuit board (PCB) in the control unit (ECU).
 28. Actuating apparatus according to claim 26 or 27, characterised in that the sensor target is actuated via a pinion (9, 9 a).
 29. Actuating apparatus according to any of claims 26 to 28, characterised in that redundant pedal travel sensors can be actuated by means of gear racks that are coupled with a brake pedal or a piston plate. 